Additional data on 40 microsec pulses at a PRF of 400 Hz are presented. A log log plot is given of threshold corneal power Pa vs exposure time in s for PRF's of 100, 200 and 400 Hz. Pa decreases with PRF for shorter exposure times but seems to converge for exposures greater than 1000 s. A Workshop dealing with the possible long term ocular effects of optical radiation on aging and macular degeneration is discussed and an assessment of light effects on the retinal pigment epithelium (RPE) is appended to this report. A preliminary experiment on the additivity and reparation of repetitive exposures of light to the same retinal site is described. Repetitive 100 s exposures of blue light (440 nm + or - 5 nm) at 24 hour intervals were found to be additive for 2 exposures at 50% of threshold, for 3 exposures at 40% threshold, and for 4 exposures at 30% of threshold. Wavelengths at 490 and 520 nm were not additive even at 50% of threshold.